US3561118A - Cutter head for dry shaver - Google Patents

Cutter head for dry shaver Download PDF

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Publication number
US3561118A
US3561118A US791978*A US3561118DA US3561118A US 3561118 A US3561118 A US 3561118A US 3561118D A US3561118D A US 3561118DA US 3561118 A US3561118 A US 3561118A
Authority
US
United States
Prior art keywords
bottom part
cutter head
driver
cheeks
surface portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US791978*A
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English (en)
Inventor
Richard Antretter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3561118A publication Critical patent/US3561118A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • B26B19/044—Manufacture and assembly of cutter blocks

Definitions

  • a p urality of spaced apart knife blades are threaded on said carrying rods.
  • a driver which is made of plastics material comprises a bottom part which is formed with an aperture adapted to receive a driver pin, and checks spaced apart in the longitudinal direction of said bottom part and extending upwardly from said bottom part and fitting each between adjacent ones of said knife blades. Said cheeks have outer narrow side faces formed with relieved surface portions in resilient engagement with confronting peripheral surface portions of said lower carrying rods.
  • the present invention relates to a cutter head for dry shavers, which cutter head comprises an upper carrying rod, two lower carrying rods, which are spaced from said upper rod on opposite sides thereof, spaced apart knife blades threaded on said rods, and a driver, which is made of plastics material and is adapted to receive a driver pin and to be connected to the cutter head by detent seats and comprises a bottom part having an aperture for receiving the driver pin, and spaced apart cheeks which are connected to the bottom part at opposite ends and adapted to be introduced between the knife blades.
  • Such cutter heads are already known (see, e.g., the printed German application No. 1,246,464).
  • the checks of the driver are so long that they extend upwardly beyond the level of the upper carrying rod, and are provided with a central slot, which merges adjacent to the upper carrying rod into a notch, which partly encloses the upper carrying rod.
  • said driver member is fitted between the knife blades of the cutter head, those side portions of the cheeks which are defined by the central slots are spread apart so that they subsequently engage the lower carrying rods with a clamping action.
  • the recesses which surround the upper carrying rods must extend upwardly close to the top knife edges of the knife blades.
  • a cutter head which is of the kind defined first hereinbefore and in which the cheeks are formed at their outer narrow side faces with relieved surface portions for a resilient engagement with the confronting peripheral sureach cheek into a pair of resilient legs.
  • the checks are formed with central recess s dividing each cheek into a pair of resilient legs.
  • the legs To lock the legs in position, they have a surface portion which conforms to the profile of the carrying rod and which engages the upper portion of the confronting surfaces of the lower carrying rod and preferably by an edge merges into a surface portion which extends toward the free end of the cheek.
  • the transition from that surface portion of the outer end face of the leg which conforms to the profile of the carrying rod to the portion which extends toward the bottom part should preferably be gradual.
  • that surface portion which extends toward the bottom part tangentially adjoins the surface portion which conforms to the profile of the carrying rod and the former portion extends along a straight line at an acute angle to the cheek axis toward the bottom part.
  • the bottom part consists substantially of a right-angled frame having a cross-piece which extends parallel to the cheeks and is formed with the aperture for receiving the driver pin, and the bottom part is designed so that the lower edg s of the knife blades rest on the longitudinal members of the frame.
  • the cheeks terminate below the level of the upper carrying rod when the driver is in position. This will ensure that the cheeks do not extend close to the knife edges and a saving in weight will be obtained. This is of great importance in cutter heads because the latter are continually accelerated in operation.
  • FIG. 1 is a sectional view showing a cutter head according to the invention
  • FIG. 2 a perspective view showing the driver according to the invention and FIG. 3 a front elevation showing the driver.
  • the cutter head consists substantially of the driver 1 and the actual cutting unit 2, which consists of a multiplicity of parallel knife blades 3, which are threaded one behind the other on the lower carrying rods 4 and the upper carrying rod 5.
  • the bottom part 6 of the driver 1 consists of a rectangular frame which has a cross-piece 7. The latter extends parallel to the checks 9, 10 and contains the aperture 8 for the driver pin 12. This filigree design of the bottom part 6 reduces the mass to be reciprocated and increases the compliance of the cheeks 9, 10.
  • each of the cheeks 9, 10 is formed with a wide central recess 10 so that the legs 9 can resiliently yield in an inward direction and their end faces 15, 16 subsequently bear against the lower carrying rods 4 Whereas their surface portions 15 conforming to the profile of the carrying rods 4 snap in between the latter.
  • those surface portions 16 of the end faces 15, 16 which adjoin the bottom part 6 extend at an acute angle from the vertical so that they have a wedgelike downward taper. At their upper end, there is a smooth transition between these surface portions 16 into those designated 15. The latter surface portions conform to the profile of the lower carrying rods 4. The surface portions 15 merge by edges 17 into surface portions 18 of the legs 9. The surface portions 18 are curved to facilitate their insertion.
  • a coil spring 13 surrounds the driver pin 12.
  • the cutter head according to the invention enables a simple fitting of the driver and ensures that the detachably mounted driver is firmly and immovably connected to the knife unit and will not impair the cutting action of the knives.
  • the width of the checks 9, 10 is selected so that the smallest distance between the surface portions of corresponding legs 9 in relaxed position exceeds the clear distance between the two lower carrying rods 4.
  • a cutter head for a dry shaver which comprises an upper carrying rod
  • a driver which is made of plastics material and comprises a bottom part which is formed with an aperture adapted to receive a driver pin, and spaced apart cheeks extending upwardly from said bottom part and fitting each between adjacent ones of said knife blades, said cheeks having outer narrow side faces formed with relieved surface portions in resilient engagement with confronting peripheral surface portions of said lower carrying rods.
  • each of said cheeks is formed with a central recess dividing said cheeks into two resilient legs.
  • each of said outer narrow side faces has a free end, a surface portion between said relieved surface portion and said free end, and an edge between the latter surface portion and said relieved surface portion.
  • each of said outer narrow side faces has a surface portion which tangentially adjoins said relieved surface portion and extends from the same along a straight line and at an acute angle to the cheek axis toward said bottom part.
  • said knife blades have lower edges resting on said longitudinal frame members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US791978*A 1968-07-25 1969-01-17 Cutter head for dry shaver Expired - Lifetime US3561118A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681703893 DE1703893A1 (de) 1968-07-25 1968-07-25 Messerkopf fuer Trockenrasierapparate

Publications (1)

Publication Number Publication Date
US3561118A true US3561118A (en) 1971-02-09

Family

ID=5688603

Family Applications (1)

Application Number Title Priority Date Filing Date
US791978*A Expired - Lifetime US3561118A (en) 1968-07-25 1969-01-17 Cutter head for dry shaver

Country Status (7)

Country Link
US (1) US3561118A (en))
BE (1) BE726876A (en))
CH (1) CH478638A (en))
DE (1) DE1703893A1 (en))
FR (1) FR2013632A1 (en))
GB (1) GB1199553A (en))
NL (1) NL6901293A (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771842A (en) * 1970-04-23 1973-11-13 Braun Ag Shaver construction
US4089109A (en) * 1977-01-17 1978-05-16 Sperry Rand Corporation Cutter head assembly
US4815209A (en) * 1985-01-09 1989-03-28 Seb S.A. Knives for a grid-type shaver, a support for the shaver knives, and a method for sharpening and mounting said knives

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125155A (en) * 1976-12-20 1978-11-01 Hitachi Maxell Ltd Receprocating electric razor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771842A (en) * 1970-04-23 1973-11-13 Braun Ag Shaver construction
US4089109A (en) * 1977-01-17 1978-05-16 Sperry Rand Corporation Cutter head assembly
US4815209A (en) * 1985-01-09 1989-03-28 Seb S.A. Knives for a grid-type shaver, a support for the shaver knives, and a method for sharpening and mounting said knives

Also Published As

Publication number Publication date
CH478638A (de) 1969-09-30
DE1703893A1 (de) 1971-10-07
NL6901293A (en)) 1970-01-27
FR2013632A1 (en)) 1970-04-03
GB1199553A (en) 1970-07-22
BE726876A (en)) 1969-06-16

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